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Limewash is basically a mass of lime that has been diluted and can be easily applied to various surfaces. Erased putty can be given its natural shade or any color can be added before applying. As it typically contains small calcite crystals, the wash finish often appears to provide a slight sheen in bright light.
People use lime wash in the same way as any type of white wash. Its purpose is not to add full coverage to a structure, but rather to include a thin layer of protection that helps enhance the underlying appearance. Like whitewash, lime is not a permanent coating, and constant exposure to the elements will eventually wear it down and a new coat will need to be applied.
For example, a wooden wall painted red and treated with a pure lime wash will still appear red, just a soft color. The wash can be adjusted to allow more or less of the underlying color to show through by adjusting the amount of liquid in the solution. Some people prefer the added texture that a light wash will add to a painted surface, while others prefer a thicker application and improved protection.
The art of limewashing has been around for thousands of years and is practiced in many cultures. It is important to note that this wash is not a painting technique, although it can be applied with brushes, but is actually more of a dyeing technique. The properties of lime penetrate the pores of wood or masonry and effectively become part of the material. Over time, the natural aging process will give the surface a certain shiny patina that many people find very attractive. Even when most of the lime has faded, traces will remain that will help improve the appearance and character of the surface.